Boat for ice-breaking and other purposes.



PATENTED JUNE 25 0.- STANGEBYE, BOAT FOR ICE BREAKING AND OTHER PURPOSES.

APPLICATION FILED APE. 7.1906.

INVENTOR gov/(AM LL ATTORNEY.

7H5 NORRIS PETERS ca. WASHINGTON, 0. c.

CONRAD STANGEBYE, OF SAN FRANCISCO, CALIFORNIA.

BOAT FOR ICE-BREAKING AND OTHER PURPOSES.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed April '7, 1906. Serial No. 310,481.

To all whom it may concern:

Be it known that I, CONRAD STANGEBYE, a subject of Norway, and master of steamship Raider, trading San Francisco and British Columbia, with address Norwegian consulate, 130 Sansome street, San Francisco, California, have invented a new type of Boat for Ice-Breaking and other Purposes,-of which the following is a specification.

My invention relates to the class of boats known as ice-breaking boats, which primarily are used to make open paths or lanes through ice for the entry and exit of ships to and from harbors, simultaneously are they frequently used as tow-boats and it will be seen, that the same boat can readily be used as a defensive and offensive member of harbor defense particularly where ice conditions obtain. I attain this object by the peculiar construction and fitting out of said boat which is illustrated in the accompanying drawing in which Figure l is a longitudinal elevation of boat, Fig. 2 is a plan view of same and Fig. 3. is a combined bow and stern elevation of the same boat. 1

Similar numbers refer to similar parts throughout the several views.

The boat as shown in Fig. 1 has a water line thus, that its bow 1. or ram will be submerged, this bow 1., which is exceeding strong and capable of sustaining severe shocks, is incorporated in the structure of the boat; the immediate continuation following above the water line consists of a very strong armored portion 2 formed into a double inclined plane, the ridge of which is somewhat raised at its middle and gradually diminishing toward its juncture with the bow portion 1 and the juncture of same ridge with the superstructure 3 of the boat. Said double inclined plane 2 will cause the sheets of ice 4 as they are broken to slide onto the surrounding surface of ice and to further facilitate and insure this result, are the inclined planes 2 terminating into wings or shields 5 extending for the whole length of said inclined planes 2 and also insuring the path or lane formed to be somewhat wider than the beam of the boat; said wings or shields 5 form a direct continuation of aforenamed inclined planes 2 and maybe otherwise supported by brackets 6 from sides of boat. At

this juncture it may be stated, that as the boat is forced ahead by its dpropelling machinery, the ice will be lifte from the surface of the water, broken and caused to slide onto the surrounding ice by reason of the inclined planes 2 and shields 5, thus forming a clear and unobstructed path or lane of water as the boat progresses, whereas the present procedure of forcing the boat on top of the ice and breaking the same by sheer weight is often impossible, due to the thickness of the ice and the resistance of the water underneath the same, and further the path or lane is strewn with the fragments of the broken ice in the form of an icepack.

The portion of the boat receiving the immediate shock and impact of the broken ice is strongly braced and strengthened both longitudinally and transversely, further is the hull of the boat particularly above the Waterline madeextra strong and protected from the grinding and crushing effect in floating or packed ice. The hull underneath the water line is formed thus, that the boat will obtain a maximum of buoyancy and stability combined with general good handling qualities.

It is seen that a series of tanks 7 either loose or incorporated in the structure of the boat are provided. These tanks are arranged in the prow of the boat and extend from a point, indicated at 3, forward to the bow 1. They operate to give buoyancy to the boat as a whole and give lifting power to the prow when the boats bow becomes submerged beneath the ice to lift the ice and thereby break it. These flotation apartments or tanks are for the purpose, by means of pumps and piping connections, to be filled or emptied as the conditions require the trim or water line of boat to be changed; the propellin machinery is preferably of the double prope ler type insuring the best handling qualities of the boat.

Referring to the superstructure of the boat, it is seen that the portion immediately adjoining the double incline plane is formed as a blunt wedge 3, having concave sides outwardly inclined; the purpose of this innovation being, that any ice bein raised above level of inclined planes 2 will e met by this wedge 3 and effectually forced clear of upper deck houses and fittings there located, said wedge 3 is made very strong and well braced for the purpose intended. The remainder of superstructure of the ordinary boat form and intended for general use and accommodation. It is seen that, as the point of juncture between aforenamed inclined planes 2 and the wedge 3 of the superstructure is about the middle of boat ;both longitudinally and transversely and, whereas this point is considered as a point of resistance, it will act as a pivoting point around which the boat may be readily swung and the direction of the boats travel through the ice greatly facilitated.

It is clear from the foregoing description, that a boat of this character and possibilities will lend itself as a very valuable member of a harbor defense, the scope of its possible services being large and eminently important, a couple of guns one forward and one aft has been shown in the drawing.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. In a boat of the character described a submerged bow portion having flotation compartments, an upper forward portion formed into a double inclined plane, and said planes extending into wings or shields beyond the sides of boat, also the upper body portion comprising the superstructure of said boat being formed into a blunt wedge in the forward part of said superstructure, for y the purpose specified.

2. In an ice-breaking boat the combination of a submerged bow, a double inclined plane terminating in wings or shields beyond the sides of boat, also superstructure formed into an outwardly inclined concaved wedge be changed at will, and for the purpose specifled.

3. A boat of the character described, com-' prising a body portion having a superstructure, and a forward portion, the forward portion having a submerged integral bow and being inclined from the said superstructure to said submerged bow and also inclined downwardly on its opposite sides, in combination with wings along either side thereof, substantially as set forth.

4. A boat of the character described, com prising a body portion having a superstructure, a submerged bow, and a long downwardly inclined forward portion extending from the superstructure to the submerged. bow, the said forward portion being inclined transversely on opposite sides, and the front of the superstructure having a forwardly extending concaved wedge portion, substantially as set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

CONRAD STANGEBYE. Witnesses:

D. E. LUND, A. BJOLSTAD. 

